Tooth for threshing-machines.



Patented Jan. 23, 1902.

G. F. BONNER.

' TOOTH FOB THRESHINGMACHINES.

(Application filed Feb. 14, 1899.)

(N0 Model.)

WITNESSES.

LN V'EN TOR K K @m Q .dttorney i UNITED STATES PATENT OFFICE.

GEORGE F. CONNER, OF PORT HURON, MICHIGAN.

TOOTH FOR THRESHlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 691,841, dated. January28, 1902.

Application filed February 14, 1899. Serial No. 705,471. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE F. CONNER, a citizen of the United States,residing at Port Huron, in the county of St. Clair and State of.

Michigan, have invented certain new and usefullmprovements in Teeth forThreshing-Machines, of which the following is a specification.

My invention relates to an improvement in the design and constructionand method of attachment of the teeth used in the cylinders ofthreshing-machines and the concaves employed in connection with saidcylinders.

The object of my invention is to provide movable teeth which shall admitof easy insertion and removal and shall be firmlyheld in place duringthe operation of the machine and not liable to be jarred loose by thevibration of the machinery or severe strains to which they maybesubjected. As hitherto constructed teeth for this purpose have been heldin position by nuts screwed upon a threaded shank on the base of thetooth. This method of construction is objectionable, for the reasonsthat they are liable to become loose while the machinery is in operationand liable to injure other parts of the machinery and also dangerous tothose operating the machine. It was also diflicult to replace a brokentooth, often requiring the removal of the cylinder, and a difficultoperation on account of the necessity of using a wrench on the inside ofthe cylinder or under the concave. If 'fastened with a nut, the shankmust be practically of the same size throughout and is liable to becomeloose at one end or the other of the bearing, and no method is providedby the ordinary construction of tightening same.

The object of my invention is to provide a tooth adapted for use inthreshing-machine cylinders and concaves which shall be easily insertedor removed without taking out'the cylinder and without the use of awrenoh, which shall afford a firm hearing at each end of the shank, andwhich shall not become loose through vibration and which if loosenedfrom any cause can be readily tightened. I attain this object by theconstruction shown in the drawings, in which Figure 1 represents acylinder-tooth or a tooth for the concave of a threshing-machine, thetwo uses being the same and my invention being adapted and designed forboth cylinder or concave. Fig. 2 is the wedge or key for holding same inplace; Fig. 3, a tooth in detail, and Fig. 4 shows the method of placingthe tooth in the slot designed for its reception. Figs. 1 and 4 aresectional and Figs. 2 and 3 perspective views.

Similar letters refer to similar parts.

In Fig. 1, B represents the bar of the threshing cylinder orconcave,'the construction being the same. In the viewitis shown to bedouble,

and the slot in same fo'rreception of tooth is seen to be constricted orsmaller midway between the poi-nts c and d. In some instances it isdesirable to use a single bar, and the method of attaching mycylinder-tooth is the same. The tooth is held in position by the key I),driven againstsame. In Fig. 2 is shown the wedge of suitable size andshape, and Fig. 3 shows the cylinder-tooth. The tooth is shown to becurved at the back of the shank, the rear of said shank being convexfrom the points or edges 6 to f. In Fig. 4 it is seen that this curvedor convex shank brings the bearing of the tooth against the center ofthe curved slot at the rear, and by this means any irregularity in thecutting of the slot does not affect the bearing of the tooth.

In Fig. 1 the rear of the shank is shown to' curve inward from c to d,thus giving the tooth a hearing at the extreme outer edge of the bars B,and the slot being constricted in the center gives it also a bearing atthe center of the bars. It will thus be seen that the shank or holdingportion of the tooth is smallest in diameter at a point intermediate theends of the hole in the bar B or between the points 0 and dand that thediameter increases longitudinally each way, so that the shank is, inelfect, a double wedge and will tend to tighten in the hole by forcetending to move the tooth either in or out. There is consequently noliability of the tooth working loose, the tendency being rather totighten always. The eifect would not be the same if the holding portionof the shank were straight. When it is desired to remove the tooth, afew blows upon the bottom of the wedge 19 releases the wedge, and thetooth can be withdrawn.

What I claim as my invention, and desire to protect by Letters Patent,is

1. The combination with a threshing-cylinder bar having a hole therein,of a tooth comprising a threshing portion and a shank or holding portionlocated in the hole which shank portion is of less diameter intermediatethe ends than at its opposite ends, and a wedge between the shank andone side of the hole and extending longitudinally of the shank,substantially as described.

2. The combination with a threshing-cylinder bar having a hole therein,of a tooth having a shank or holding portion one side of which shank islongitudinally conoaved and the opposite side of which shank isstraight, and a wedge between the straight side of the shank and oneside of the hole, substantially as described.

3. The combination with a threshing-cylinder bar having a hole thereinone side of which is transversely concaved, of a tooth having a shank orholding portion located in the hole which shank is of less diameterintermediate the ends than at its opposite ends, one side of said shankbeing transversely convexed, and a Wedge between the opposite straightside of the shank and one side of the hole, substantially as described.

4. The combination with athreshing'cylinder bar, having a hole therein,one side of which is longitudinally concaved and also transverselyconcaved, of a tooth having a shank or holding portion in said hole, oneside of said shank being longitudinally concaved and transverselyconvexed, and a wedge between the opposite straight side of the shankand one side of the hole, substantially as described.

5. A tooth for threshing-machines provided with a threshing portion anda shank or hold ing portion, which shank portion has a substantiallystraight side and an opposite side longitudinally inbent or concavedintermediate its ends and transversely convexed, substantially asdescribed.

6. A tooth for a threshing-machine cylinder consisting of a bladeportion, and a shank portion curved inwardly from the blade to at ornear its opposite end and convexed in cross-section on its rear edge,substantially as described.

7. The combination with a threshing-cylinder bar having an openingtherein formed with a curved concaved wall and an opposite straightwall, of a tooth having the rear edge of its shank fashioned to fit thecurved wall of the opening, and curved outward longitudinally and awedge interposed directly between the front edge of the tooth-shank andthe straight wall of the opening, substantially as described.

8. A tooth for threshing-machines consisting of a blade portion and ashank portion which latter portion has one edge recessed inwardly fromat or near its opposite ends to form oppositely-disposed wedge-likeportions and the shank havinga substantially straight edge opposite therecessed edge, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE F. CONNER.

Witnesses:

H. B. HOYT, C. A. HARRINGTON.

